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Longitudinal associations between sex hormone-binding globulin and insulin resistance

Journal article
Authors Kristin Ottarsdottir
Margareta Hellgren
David Bock
Anna G Nilsson
Bledar Daka
Published in Endocrine Connections
Volume 9
Issue 5
Pages 418-425
ISSN 2049-3614
Publication year 2020
Published at Institute of Clinical Sciences, Department of Surgery
Institute of Medicine, School of Public Health and Community Medicine
Institute of Medicine
Pages 418-425
Language en
Links dx.doi.org/10.1530/ec-20-0141
Keywords sex hormone-binding globulin, cohort studies, insulin resistance, pre-diabetes, prospective studies, sex hormones, metabolic syndrome, risk, testosterone, women, shbg, population, men, Endocrinology & Metabolism
Subject categories Endocrinology and Diabetes

Abstract

Purpose: We aimed to investigate the association between SHBG and the homeostatic model assessment of insulin resistance (HOMA-Ir) in men and women in a prospective observational study. Methods: The Vara-Skovde cohort is a random population of 2816 participants living in southwestern Sweden, aged 30-74. It was recruited between 2002 and 2005, and followed up in 2012-2014. After excluding participants on insulin therapy or hormone replacement therapy, 1193 individuals (649 men, 544 women) were included in the present study. Fasting blood samples were collected at both visits and stored in biobank. All participants were physically examined by a trained nurse. SHBG was measured with immunoassay technique. Linear regressions were computed to investigate the association between SHBG and HOMA-Ir both in cross-sectional and longitudinal analyses, adjusting for confounding factors. Results: The mean follow-up time was 9.7 +/- 1.4 years. Concentrations of SHBG were significantly inversely associated with log transformed HOMA-Ir in all groups with estimated standardized slopes (95% CI): men: -0.20 (-0.3;-0.1), premenopausal women: -0.26 (-0.4;-0.2), postmenopausal women: -0.13 (-0.3;-0.0) at visit 1. At visit 2 the results were similar. When comparing the groups, a statistically significant difference was found between men and post-menopausal women (0.12 (0.0;0.2) P value = 0.04). In the fully adjusted model, SHBG at visit 1 was also associated with HOMA-Ir at visit 2, and the estimated slopes were -0.16 (-0.2;-0.1), -0.16 (-0.3;-0.1) and -0.07 (-0.2;0.0) for men, premenopausal and postmenopausal women, respectively. Main conclusion: Levels of SHBG predicted the development of insulin resistance in both men and women, regardless of menopausal state.

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